1 files changed, 144 insertions, 0 deletions
diff --git a/app/core/gimpdrawable-combine.c b/app/core/gimpdrawable-combine.c
new file mode 100644
index 0000000..e48d9dd
--- /dev/null
+++ b/app/core/gimpdrawable-combine.c
@@ -0,0 +1,144 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpbase/gimpbase.h"
+
+#include "core-types.h"
+
+#include "gegl/gimpapplicator.h"
+
+#include "gimp.h"
+#include "gimpchannel.h"
+#include "gimpchunkiterator.h"
+#include "gimpdrawable-combine.h"
+#include "gimpimage.h"
+
+
+void
+gimp_drawable_real_apply_buffer (GimpDrawable           *drawable,
+                                 GeglBuffer             *buffer,
+                                 const GeglRectangle    *buffer_region,
+                                 gboolean                push_undo,
+                                 const gchar            *undo_desc,
+                                 gdouble                 opacity,
+                                 GimpLayerMode           mode,
+                                 GimpLayerColorSpace     blend_space,
+                                 GimpLayerColorSpace     composite_space,
+                                 GimpLayerCompositeMode  composite_mode,
+                                 GeglBuffer             *base_buffer,
+                                 gint                    base_x,
+                                 gint                    base_y)
+{
+  GimpItem          *item  = GIMP_ITEM (drawable);
+  GimpImage         *image = gimp_item_get_image (item);
+  GimpChannel       *mask  = gimp_image_get_mask (image);
+  GimpApplicator    *applicator;
+  GimpChunkIterator *iter;
+  gint               x, y, width, height;
+  gint               offset_x, offset_y;
+
+  /*  don't apply the mask to itself and don't apply an empty mask  */
+  if (GIMP_DRAWABLE (mask) == drawable || gimp_channel_is_empty (mask))
+    mask = NULL;
+
+  if (! base_buffer)
+    base_buffer = gimp_drawable_get_buffer (drawable);
+
+  /*  get the layer offsets  */
+  gimp_item_get_offset (item, &offset_x, &offset_y);
+
+  /*  make sure the image application coordinates are within drawable bounds  */
+  if (! gimp_rectangle_intersect (base_x, base_y,
+                                  buffer_region->width, buffer_region->height,
+                                  0, 0,
+                                  gimp_item_get_width  (item),
+                                  gimp_item_get_height (item),
+                                  &x, &y, &width, &height))
+    {
+      return;
+    }
+
+  if (mask)
+    {
+      GimpItem *mask_item = GIMP_ITEM (mask);
+
+      /*  make sure coordinates are in mask bounds ...
+       *  we need to add the layer offset to transform coords
+       *  into the mask coordinate system
+       */
+      if (! gimp_rectangle_intersect (x, y, width, height,
+                                      -offset_x, -offset_y,
+                                      gimp_item_get_width  (mask_item),
+                                      gimp_item_get_height (mask_item),
+                                      &x, &y, &width, &height))
+        {
+          return;
+        }
+    }
+
+  if (push_undo)
+    {
+      gimp_drawable_push_undo (drawable, undo_desc,
+                               NULL, x, y, width, height);
+    }
+
+  applicator = gimp_applicator_new (NULL);
+
+  if (mask)
+    {
+      GeglBuffer *mask_buffer;
+
+      mask_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
+
+      gimp_applicator_set_mask_buffer (applicator, mask_buffer);
+      gimp_applicator_set_mask_offset (applicator, -offset_x, -offset_y);
+    }
+
+  gimp_applicator_set_src_buffer (applicator, base_buffer);
+  gimp_applicator_set_dest_buffer (applicator,
+                                   gimp_drawable_get_buffer (drawable));
+
+  gimp_applicator_set_apply_buffer (applicator, buffer);
+  gimp_applicator_set_apply_offset (applicator,
+                                    base_x - buffer_region->x,
+                                    base_y - buffer_region->y);
+
+  gimp_applicator_set_opacity (applicator, opacity);
+  gimp_applicator_set_mode (applicator, mode,
+                            blend_space, composite_space, composite_mode);
+  gimp_applicator_set_affect (applicator,
+                              gimp_drawable_get_active_mask (drawable));
+
+  iter = gimp_chunk_iterator_new (cairo_region_create_rectangle (
+    &(cairo_rectangle_int_t) {x, y, width, height}));
+
+  while (gimp_chunk_iterator_next (iter))
+    {
+      GeglRectangle rect;
+
+      while (gimp_chunk_iterator_get_rect (iter, &rect))
+        gimp_applicator_blit (applicator, &rect);
+    }
+
+  g_object_unref (applicator);
+}